All written languages make use of a script. This is the collection of characters and diacritics that are used together to write. There are many scripts and many languages can be expressed in multiple scripts. There is a standard for scripts; the ISO-15924.
The scripts can be identified by using a four character code that can/should start with a capital. In the OmegaWiki list of languages, when a language is known in multiple scripts, we want to have a seperate entry per script for that language. One motivation is that we do not assume one script to be more relevant then another and, having them together does not look good.